COORDINATE AND KAHLER SIGMA-MODEL ANOMALIES AND THEIR CANCELLATION IN STRING EFFECTIVE FIELD-THEORIES

We discuss the complete set of one-loop triangle graphs involving the Yang-Mills gauge connection, the Kahler connection and the sigma-model coordinate connection in the effective field theory of (2, 2) symmetric Z(N) orbifolds. That is, we discuss pure gauge, pure Kahler and pure sigma-model coordinate anomalies as well as the mixed anomalies, such as Kahler-gauge, some of which have been discussed elsewhere. We propose a mechanism for restoring both Kahler and sigma-model coordinate symmetry based upon the introduction of two types of counterterms. Finally, we enlarge the sigma-model generalization of the Green-Schwarz mechanism to allow the removal of the universal parts of a wider class of anomalies than those previously discussed.